Where might one find the option to prevent/disable Lightning from presenting the Welcome to Thunderbird?As well as all the incessant "Sorry - we are unable to communicate with our sign-in server,..."Funny,.. I do not recall ever telling either program to communicate with anyone,...(Lightning being used as a Stand-alone Calendar only)

Thank you again Morat, I found to edit about:config(prefs.js) I actually had to go to Tools/Options/Advanced/General tab (Advanced Configuration) [Config Editor...] button.However, yes, the program is now presenting a Mail Account Setup dialog box.So if I may ask, what is the preference to prevent TB from presenting an Account Setup dialog box?

ShortFuse wrote:Why don't you just set Thunderbird up with a free new email account and just not use it. Configure the server settings never to get mail. That will do away with the constant mail set up.